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Protic ionic liquids (PILs) based on 2-methylpyridine (2-MPy) and trifluoroacetic acid (TFA) have been synthesized under multiple conditions and with different proportions of their constituents. These PILs present a brown color of variable intensity and the factors responsible for the presence of these impurities have been examined. UV–vis spectroscopy analyses revealed that both TFA and 2-MPy can...
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